it only show how much time remains before it goes empty since the new update?

i liked how before it would tell me how long it has been off the charger.

maybe i can't find it?

I feel the same way, but you can find how long you've been off the charger, sort of. When you look at the graph, it shows when you took it off the charger, all the way at the left. It should show hash marks with a time underneath then (10am for example). I don't know how it works if you go more than 24 hours as I use mine quite a bit and usually charge it every night. But that can give you an idea going by the graph, it just doesn't display it in words anymore.